Three candidates

• http://flowplayer.org/tools/scrollable/index.html
• http://www.smoothdivscroll.com/
• http://www.logicbox.net/jquery/simplyscroll/ (pick this one)

Final decision: pick the 3rd one.

Reasons:

1. full tested: jquery 1.2-1.4
2. multiple broswers tested.
3. simple example